I don't mean to be a spoiler here but, ............
CFM doesn't mean a whole lot, in fact it doesn't mean squat unless you also include temp. delta's(inlet vs outlet) at various pressures......efficiency.

I'd rather have a 600CFM IC with a 95% efficiency than a 1000CFM IC with a 80% efficiency.

Fun stuff. What is the rest of your build? EFI? If CIS how are you getting fuel?

I would put in / out pressure differential gauge on it to find out if it is creating a restriction.

Until that is the case I would not replace it. Most aftermarket I/C's are not going to be as well ducted and I suspect as efficient. They can also add volume and a bit to lag. We have probably the best end tanks of any 930 IC.

An in/out temp gauge would be a good thing to try to.

I am guessing the stock IC is as good as the Koklen or a little better. intercooler

Porsche with Andial in 1992 had an upgrade (S2) where they removed the stock core and welded in a thicker bar and plate core. This was to qualify this mod for and IMSA class they wanted to run. Thus, there may be something to an upgrade.

Another good think about the C2T IC is the turbo to IC conection. It transitions cleanly and is formed on the inside so there it a minimal disruption of air flows at its two connections for less pressure gain.

I had one and can not tell you if it helps. One of the nice things about the stock tube&fin IC is cooling air can get through it easier and that is one of our challenges where we can not put it in the on coming air stream.

Hi 911,
Apologies for the slow response - my build is more mild than many on here. I have the Turbo S 3.6 cams, BB headers, Garret GT35R turbo, high flow cat, MSD ignition and an AEM standalone engine management system.

I haven't decided whether I'll try to increase performance any further. Honestly, I've been having plenty of fun with the car with the boost under 1 bar!
Best,
John

Quote:

Originally Posted by 911st

JB,

Fun stuff. What is the rest of your build? EFI? If CIS how are you getting fuel?

I would put in / out pressure differential gauge on it to find out if it is creating a restriction.

Until that is the case I would not replace it. Most aftermarket I/C's are not going to be as well ducted and I suspect as efficient. They can also add volume and a bit to lag. We have probably the best end tanks of any 930 IC.

An in/out temp gauge would be a good thing to try to.

I am guessing the stock IC is as good as the Koklen or a little better. intercooler

Porsche with Andial in 1992 had an upgrade (S2) where they removed the stock core and welded in a thicker bar and plate core. This was to qualify this mod for and IMSA class they wanted to run. Thus, there may be something to an upgrade.

Another good think about the C2T IC is the turbo to IC conection. It transitions cleanly and is formed on the inside so there it a minimal disruption of air flows at its two connections for less pressure gain.

I had one and can not tell you if it helps. One of the nice things about the stock tube&fin IC is cooling air can get through it easier and that is one of our challenges where we can not put it in the on coming air stream.